get_hosted_zone - multiple VPC associations to a private zone

[ksivask]

>>> boto.__version__
'2.45.0'
[zone-vpcs.txt](https://github.com/boto/boto/files/731411/zone-vpcs.txt)

>>> r53c.get_hosted_zone('Z21777K8BLAH')

DEBUG:boto:<?xml version="1.0"?>
<GetHostedZoneResponse xmlns="https://route53.amazonaws.com/doc/2013-04-01/"><HostedZone><Id>/hostedzone/Z21777K8BLAH</Id><Name>eng.blah.net.</Name><CallerReference>38E618A9-B9DB-3C00-9260-A58625F5DA84</CallerReference><Config><Comment>private subdomain</Comment><PrivateZone>true</PrivateZone></Config><ResourceRecordSetCount>2</ResourceRecordSetCount></HostedZone><VPCs><VPC><VPCRegion>us-west-2</VPCRegion><VPCId>vpc-19295xxx</VPCId></VPC><VPC><VPCRegion>us-east-1</VPCRegion><VPCId>vpc-f6d9dxxx</VPCId></VPC></VPCs></GetHostedZoneResponse>

{u'GetHostedZoneResponse': {u'VPCs': {u'VPC': {u'VPCId': u'vpc-f6d9dxxx', u'VPCRegion': u'us-east-1'}}, u'HostedZone': {u'ResourceRecordSetCount': u'2', u'CallerReference': u'38E618A9-B9DB-3C00-9260-A58625F5DA84', u'Config': {u'Comment': u'private subdomain', u'PrivateZone': u'true'}, u'Id': u'/hostedzone/Z21777K8BLAH', u'Name': u'eng.blah.net.'}}}

The multiple VPC associations are returned in the XML response, but the post-parsing returns only 1 item.

Fix:

>>> e = boto.jsonresponse.Element(list_marker=('NameServers', 'VPCs'), item_marker=('NameServer', 'VPC',))
>>> h=boto.jsonresponse.XmlHandler(e, None)
>>> h=boto.jsonresponse.XmlHandler(e, None)
>>> h.parse(body)
>>> e
{u'GetHostedZoneResponse': {u'VPCs': [{u'VPCId': u'vpc-19295xxx', u'VPCRegion': u'us-west-2'}, {u'VPCId': u'vpc-f6d9dxxx', u'VPCRegion': u'us-east-1'}], u'HostedZone': {u'ResourceRecordSetCount': u'2', u'CallerReference': u'38E618A9-B9DB-3C00-9260-A58625F5DA84', u'Config': {u'Comment': u'private subdomain', u'PrivateZone': u'true'}, u'Id': u'/hostedzone/Z21777K8ACVYHU', u'Name': u'eng.blah.net.'}}}

Since http://docs.aws.amazon.com/Route53/latest/APIReference/API_GetHostedZone.html indicates NameServers and VPCs as lists, the code should adjust for both
zone-vpcs.txt